SOIL POPULATION AM) T//E CROWING PLANT 167

TABLE XV.—MATERIAL BALANCE SHEET: BROADBALK SOIL,

ROTHAMSTED,

(L«. PKH ACME FEE ANNUM.)

Farmyard Manurf Added.
N« Manure Added,

C,
! N.
C.
N.

Added in farmyard nuiuirc .
Added in *tubl)l«*
j
nt!
nil I

Total added Tiikrrt from toil . Stonii in still
3iKV> ml
nil 4<>
Krt1l
r
nil nil

1 tmt from soil Per cent.
3700 95
170 3,cx>
84 i i or)
nil** till

Initial C* ; X ratio In farmyard manure, 18 : I
Final C*: M ratio in soil, 10: t.

* ('Jain of 6 lb. Sec p. 173.

TABLE XVL •-ANNUAL EMKROY CIIANOKS IN SOIL: IWOAD-
BALK. API'KOXIMATE VALUES ONLY.

Ml!.Ll«MS Of

l**tmyttd Added.
*Adcferf!M

Ailili*rl in manure! . « Atli!*»fl in Miibhir .
14
2
nil

Tfiknt from froil . Stnr^i In boil .....
16
nil
0-3 nil

I)iN\i|»*itf'4 JUT atmutn
«5
i

Pff *i/iy : calorit*v .
Ki|f4iv»ili*tit to * The litiifiaii f<Mxl gwwii providcH for
12 nwn.
27*10 1 man, j rnun.

It will be that each acre of the dunged land losti> cm an
41,000 per day, while each acre* of the
unmanured land on an average 2700 calories per day.
These numbers are Interesting whitn we reflect that the
human food produced on. the dunged land yields only 7000